AH314 データシートの表示（PDF） - TriQuint Semiconductor
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AH314 Datasheet PDF : 6 Pages
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AH314
2.3-2.9 GHz WiMAX 2W Driver Amplifier
2.3 – 2.7 GHz Application Note: Changing Icq Biasing Configurations at +5V
The AH314 can be configured to operate with lower bias current by varying the bias-adjust resistors R1 & R2. R1 sets the
quiescent current in the output stage, while R2 sets the quiescent current in the input stage. The recommended circuit
configurations shown previously in this datasheet have the device operating with a 600 mA as the quiescent current (ICQ). This
biasing level represents a tradeoff in terms of EVM and efficiency. Lowering ICQ will improve upon the efficiency of the
device, but degrade the EVM performance. Raising ICQ will improve the EVM performance, but degrade the efficiency of the
device. Measured data shown in the plots below represents the AH314 measured and configured for 2.6 GHz applications. It is
expected that variation of the bias current for other frequency applications will produce similar performance results.
EVM vs Pout vs Icq
F = 2.6GHz, 802.16-2004 OFDMA, 64QAM-1/2, 1024 FFT, 20 symbols,
7
30 channels
6
600 mA
500 mA
400 mA
300 mA
5
Table 1 : Reduced Current Operation
Icq
(mA)
R1
R2
VPD, Vbias, Vcc
(Ω) (Ω)
(V)
600
68
150
5
500
86
180
5
400
110 300
5
300
160 330
5
4
3
2
1
0
20
21
22
23
24
25
26
27
Pout (dBm)
2.3 – 2.7 GHz Application Note: Changing Icq Biasing Configurations at +3.3V
Table 2 : Reduced Current Operation
Icq
(mA)
R1
R2 VPD, Vbias, Vcc
(Ω) (Ω)
(V)
500
3
3
3.3
400
11
15
3.3
350
17
24
3.3
250
43
45
3.3
EVM vs Pout vs Icq
F = 2.6GHz, 802.16-2004 OFDMA, 64QAM-1/2, 1024 FFT, 20
7
symbols, 30 channels
6
5
4
3
2
500 mA
400 mA
350 mA
250 mA
1
0
20
21
22 Pout (dBm2)3
24
25
Specifications and information are subject to change without notice.
TriQuint Semiconductor, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: info-sales@tqs.com • Web site: www.TriQuint.com
Page 5 of 6 September 2008
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